A U.S. Postal Service worker was found dead in her mail truck in Woodland Hills on Friday.
Peggy Frank, 63, was on her route as temperatures rose upwards of 115 degrees.
After paramedics arrived on the scene and and attempted to revive her without success, she was pronounced dead.
She worked for the Postal Service for 28 years and was going to retire soon.
Mail trucks aren't equipped with air condition, so on a hot day, it can be tough to stay cool.
This wasn't Frank's first time having health issues on the job - she got heat stroke last year during summer.
LA County Coroner's Office has competed Frank's autopsy, but have not announced a cause of death.
Her family believes it's likely her death was related to the heat and the fact that she couldn't cool off in her truck.